condition mean min max ZT0-3 26.185519885 20.031885510000002 32.33915426 ZT4-7 6.89356099925 5.448092719 8.3390292795 ZT8-11 9.0321230125 6.516967320499999 11.5472787045 ZT12-15 24.32094965 15.96218946 32.67970984 ZT16-19 29.315229225 27.883855224999998 30.746603225 ZT20-23 21.0908037425 19.998395164999998 22.18321232